﻿// CSharp Editor Example with Code Completion
// Copyright (c) 2006, Daniel Grunwald
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are 
// permitted provided that the following conditions are met:
// 
// - Redistributions of source code must retain the above copyright notice, this list 
//   of conditions and the following disclaimer.
// 
// - Redistributions in binary form must reproduce the above copyright notice, this list
//   of conditions and the following disclaimer in the documentation and/or other materials 
//   provided with the distribution.
// 
// - Neither the name of the ICSharpCode team nor the names of its contributors may be used to 
//   endorse or promote products derived from this software without specific prior written 
//   permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &AS IS& AND ANY EXPRESS 
// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 
// IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 
// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
using System.Threading;

using DigitalRune.Windows.TextEditor;
using DigitalRune.Windows.TextEditor.Completion;
using System.Text;

namespace Zove.Modeling.Editor {
    class CodeCompletionKeyHandler {
        Form1 mainForm;
        TextEditorControl editor;
        CompletionWindow codeCompletionWindow;

        private CodeCompletionKeyHandler(Form1 mainForm, TextEditorControl editor) {
            this.mainForm = mainForm;
            this.editor = editor;
        }

        public static CodeCompletionKeyHandler Attach(Form1 mainForm, TextEditorControl editor) {
            CodeCompletionKeyHandler h = new CodeCompletionKeyHandler(mainForm, editor);

            editor.ActiveTextAreaControl.TextArea.KeyUp += h.TextAreaKeyEventHandler;

            // When the editor is disposed, close the code completion window
            editor.Disposed += h.CloseCodeCompletionWindow;

            return h;
        }

        private bool isBuffering = false;

        private StringBuilder buffer = null;

        /// <summary>
        /// Return true to handle the keypress, return false to let the text area handle the keypress
        /// </summary>
        public void TextAreaKeyEventHandler(object sender, KeyEventArgs e) {
            char key = (char)e.KeyValue;
            if (codeCompletionWindow != null) {
                // If completion window is open and wants to handle the key, don't let the text area
                // handle it
                if (codeCompletionWindow.ProcessKeyEvent(key)) { }
            }
            if (!isBuffering && (key == ' ' || key == ';' || key == ',')) {
                isBuffering = true;
                buffer = new StringBuilder();
            } else if (isBuffering) {
                buffer.Append(key);
            } else if (key == '.') {
                ICompletionDataProvider completionDataProvider
                    = new CodeCompletionProvider(mainForm);

                codeCompletionWindow = CompletionWindow.ShowCompletionWindow(
                    mainForm,					// The parent window for the completion window
                    editor, 					// The text editor to show the window for
                    mainForm.FileName,		// Filename - will be passed back to the provider
                    completionDataProvider,		// Provider to get the list of possible completions
                    key							// Key pressed - will be passed to the provider
                    , true, true, true);
                if (codeCompletionWindow != null) {
                    // ShowCompletionWindow can return null when the provider returns an empty list
                    codeCompletionWindow.Closed += new EventHandler(CloseCodeCompletionWindow);
                }
            }
        }

        void CloseCodeCompletionWindow(object sender, EventArgs e) {
            if (codeCompletionWindow != null) {
                codeCompletionWindow.Closed -= new EventHandler(CloseCodeCompletionWindow);
                codeCompletionWindow.Dispose();
                codeCompletionWindow = null;
            }
        }
    }
}
